Means for assembling commutators



MEANS FOR ASSEMBLING COMMUTATORS.

APPLICATION FILED OCT. 31, I919.

Patented Dec. 13, 1921.

Arron/vars UNITED STATES PATENT OFFICE.

LBNOLD GRUB, OF CLEVELAND, CHARLES B. KECK, 0F WICKLIFFE, AND FRED J. 3m, 01 EAST CLEVELAND, OHIO, ASSIGNORS TO THE HOMER COMMUTATOR COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO. I

MEANS FOR ASSEMBLING COMMUTATORS.

Specification of Letters Patent. Patented D 13, 1921-.

Application filed October 31, 1919. Serial No. 334,889.

To all whom it may concern:

Be it known that we, ARNOLD GROB, resident of Cleveland, count of Cuyahoga, and State of Ohio, CHARLES Knox, a resident of -Wicklifi'e, county of'Lake, State of Ohio, and FRED J. Bsmmresident of East Cleveland, county of Cuyahoga, State of Ohio,

have invented new and useful Improvements in Means for Assembling Commutators, of which the following is a specification, the principle of the invention being herein explained and the best mode in which we have contemplated applying that principle, so as to distinguish it from other inventions.

Our invention relates to means for assembling commutators, its object being to permit such assembly to be effected in an efiicient and economical manner. The said invention consists of means hereinafter fully described and particularly set forth in the claims.

The annexed drawing and the following description set forth in detail certain means embodying our invention, the described means, however, constituting but one of various mechanical forms in which the principle of the invention may be applied.

In said annexed drawings:

Figure 1 represents a plan of a device embod 'ng our invention. I

ig. 2 represents an axial section thereof.

Fig. 3 represents an axial section and end view of the interio or central tube which constitutes a part tator.

Fi 4 represents a plan-of the inner assemby-ring.

Fig. 5 represents a s ide elevationof such assembly .ring.

Fig. 6 represents a horizontal section taken on the plane indicated byline VI-VI in of the interior assem ly ring. I r Fig. 8 represents a fragmentary axial section ofsuch modified-form, and taken u on the plane. indicated by line VIII-- I? inFig. 6.

The illustrated embodiment of our invention comprises an annular 1, F1g 4, which consists of a plurality o se cuts 2, the ring bein shown as compo of three ants in t 's particular mstance. e outer lateral surface of the mug hes f the finished commu-- Fi 5'. ner ends df thecommutator se Eig; 7 represents a 'lan of amodified form in the surface of. a cone, as shown, andthe planes 4, which are inclined with relation to the axis of the ring. In the circumferential portion of each segment are formed registermg grooves 5 5, in which lie respectively expansible or elastic bands 6. One of the segments is provided with two pins 7 7 respectively, which are placed in the grooves, the bands being placed so as to leave their free ends adjacent to these pins. The latter prevent circumferential displacement of the bands so that their free ends will not fall opposite one ofthe divisional planes. These bands, it will be noted, hold the segments of this ring together, but permit them to yield radially, and thus perm1t the ring as a whole to expand.

- The interior diameter of this ring, which we shall refer to as the interior assembly ring, is such as will receive the commutator segments 8 when in their assembled position. The interior surface of the ring is c lindrical to conform with the outer cylindrical surface of the assembled commutator bars.

An outer annular assembly rin 9 is provided of unitary structure and Iiaving an interior conicalsurface 10 of the same inclination as that of the outer conical surface of the interior ring 1.

In using the above described device, we first take the interior assembly ring and assemble therein around the'inner cylindrical upon the upper conical surface of this ring 13, and a cylindrical paper insulation 15 having been placed between the inner surfaceof the segments and the tube 12, as

. shown in Fi 2. A second V-shaped mica ring 14 is t en placed upon the ents' 'over which is slipped a second end ring. or

cap 13. The interior diameter of-tlie'ring 1 is such that whenthe se ants, insulatlon and tube 12 are; thus assem led, the assembly ring will be slightly expanded, as shown'ln ring dotted lines in Fig. 5, in which condition the bandsv 6 6 will exert an inward radial pressure against the commutator bars or segments, and thus hold the entire structure together with sufficient force to permit the and the assembled contents thereof to be handled. Pressure is then exerted transversely so as to compress all of the segments and the insulation inwardly, and while under such pressure the other end of the tube 12 is spun as at 16, thereby holding the entire structure securely in place.

This transverse pressure isexerted by, inserting'the inner assembly ring in the interior of the, outer ring 9, and then pressing the outer ring upon the inner ring so as to cause the conical surfaces which are in contact to effect the necessary pressure, as will be readily understood.

After the tube 12 has been riveted while the segments are thus under pressure, the interior ring is removed from the outer ring 9 and the assembled commutator removed from the ring 1.

The commutator may then be given its final finish, as will be well understood by those skilled in the art.

In Figs. 7' and 8, we have shown a modification of the interior assembly ring, which consists, however, merely in locating the grooves 5 in the upperand lower surfaces of the ring, as shown. In other respects, the construction and use of the modified form is similar to that of the first described form. a

- By inclining the planes of separation of the segments of the interior ring, as illustrated, it will be seen that the line of division crosses a plurality of surfaces of the adjacent commutator segments or bars, and thus more securely and thoroughly holds them in place.

,What we claim is:

1. In means for assembling commutators,

the combination of an outer holding ring; .an inner multi-part ring adapted to receive and hold commutator segments in their assembled position and having an exterior. surface conforming with the interior surface of said outer ring; and elastic'means for holding the parts of said multi-part tator segments in their assembled position, and having its outer lateral surface lying in the surface of a cone, and adapted to fit within the conical interior of said outer ring.-

4. In means for assembling commutators, amultipart ring composed of elements separated from each other on planes inclined to the rings axis, and yieldingly held together.

I 5. In means for assembling commutators, a multipart ring composed of elements separated from each other on planes inclined to 'the rings axis, and held together by means of one or more'elastic bands.

6. In means for assembling commutators, a multipart ring having an outer lateral conical surface and composed of elements separated from each other on planes inclined to the rings axis; said elements being yieldingly lhe'ld together.

. In means for assembling commutators,

-the combination with a multipart ring adapted to receive and hold commutator segments in their assembled position, and having its parts provided with registering grooves; of a resilient split contractile ring 1n said grooves adapted to hold said parts together; and means for holding saidring against circumferential rotative movement. Signed by us, this 14th day of October,

' ARNOLD GROB.

CHARLES B.. KECK. FRED J. BAIRD.

ble ring adapted to receive and hold commu- 

